Question: complex root finding

March 16 2013 by mahdi1625 10
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 In the following root finding code, the wn[1] is calculated as [] although it is within the specified range. would you please tell me why?

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restart
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`ωn` := Array(0 .. 30); j := 7; for i to 2 do `ωn`[i] := [RootFinding:-Analytic(eval(xx*tan(xx)+(.5*ln(0.1e-4)*(1/122)-I*i*Pi*(1/122))), xx = (j-1)*Pi+0*I .. j*Pi+I, digits = 10)] end do

Array(%id = 427683488)

  

7

  

[]

  

[18.85205919+0.2731504612e-2*I]

 (1)
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